JP2001320725A - Environment-adaptive image display system, presentation system, image processing method, and information storage medium - Google Patents

Abstract

(57) [Summary] To provide an environment-adaptive image display system, a presentation system, an image processing method, and an information storage medium. SOLUTION: Based on color light information (more precisely, tristimulus values of RGB or XYZ) measured by a color light sensor 60,
XYZ reflecting the visual environment using the color light information processing unit 140
A value is generated, and the input / output profile of the projector is corrected using the profile management unit 130.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an environment-adaptive image display system, a presentation system, an image processing method, and an information storage medium.

[0002]

2. Description of the Related Art When a presentation or a meeting is held at a plurality of different places, it is important to reproduce an image intended by the creator at any place in order to give an effective presentation. .

As an idea of adjusting the appearance of such an image, there is an idea of color management that reproduces a color by managing input / output characteristics of a device, but the specific technique is not clear.

In particular, when an image is projected and displayed using a screen and a projector, it is difficult to reproduce an appropriate color unless the type of screen is considered in addition to the ambient light.

[0005] In recent years, the definition of projectors has been increased, and color reproducibility has also become important.

Further, in recent years, the size of the projector has been reduced, and the projector has been easily carried. Thus, for example,
Although a presentation may be made at the customer, it is difficult to adjust the color in advance according to the environment of the customer, and it takes too much time to manually adjust the color at the customer.

The present invention has been made in view of the above problems, and has as its object to provide an environment-adaptive image display system, a presentation system, and an image display system capable of reproducing almost the same color in a plurality of different places in a short time. A processing method and an information storage medium are provided.

[0008]

In order to solve the above-mentioned problems, an environment-adaptive image display system according to the present invention is based on visual environment information obtained by visual environment grasping means for grasping a visual environment in a display area of an image. An image display system that corrects and displays the color of the image, and converts a predetermined color in the visual environment information into a coordinate value in a predetermined color space, and the predetermined color in a predetermined reference environment. Based on the coordinate values in a predetermined color space and the converted coordinate values, based on the color light information processing means for obtaining a coordinate value that is a complementary color pair of the converted coordinate value, And correcting means for correcting input / output characteristic data for display used by the means for displaying the image.

According to the present invention, the display input / output characteristic data used by the image display means is corrected based on the coordinate value reflecting the environment information and the coordinate value forming the complementary color pair, thereby adapting to the display environment. To display the image. As a result, the same image can be displayed regardless of the applied environment by absorbing the difference in the display environment. Therefore, substantially the same color can be reproduced in a plurality of different places in a short time.

In particular, by correcting input / output characteristic data for each gradation based on coordinate values forming a complementary color pair, the influence of environmental light affecting ideal color light is removed, and an ideal white balance is obtained. be able to.

Here, as the visual environment, for example,
Ambient light (illumination light, natural light, and the like), a display target (display, wall surface, screen, and the like), and the like correspond to this.

The predetermined color is preferably white (gray), but is not limited to white.

Further, as a color space, for example, L * a *
b * (also referred to as Lab; hereinafter abbreviated as “Lab”) space, L * u * v * space, L * C * h space, U *
A V * W * space, an xyY (also referred to as Yxy) space, and the like correspond.

[0014] A complementary color pair is a color pair that becomes gray when colors are mixed.

Further, the visual environment grasping means includes, for example, a luminance sensor for measuring a luminance value of a display area, a color light sensor for measuring an RGB value and an XYZ value of the display area, and a chromaticity value of the display area. One of the chromaticity sensors to be measured or a combination thereof can be applied.

Further, the color light information processing means obtains an inverse vector of a binding vector indicating a coordinate position of the converted coordinate value in the color space as the coordinate value to be the complementary color pair, and the correction means obtains the calculated value. Preferably, the input / output characteristic data is corrected using the inverse vector as a correction value.

According to this, since the input / output characteristic data can be quantitatively corrected, the correction can be performed at high speed. In particular, by correcting the input / output characteristic data for each predetermined gradation unit, the color light information for each gradation unit can be uniquely determined using the input / output characteristic data.

Here, the constraint vector is a constraint vector at a gray point on a predetermined color plane in the color space. The term vector is used to mean a vector having a magnitude and a direction.

Further, the correction means performs gamma correction as correction of the input / output characteristic data based on the coordinate values forming the complementary color pair.

According to this, accurate color reproduction can be performed by performing gamma correction.

Further, it is preferable that the color light information processing means obtains coordinate values of a plurality of complementary color pairs for each predetermined gradation unit.

According to this, by obtaining the coordinate values of a plurality of complementary color pairs for each gradation unit, even when the colors of each gradation are reproduced, correction suitable for the gradation to be reproduced can be performed. Therefore, an appropriate image display can be performed regardless of the gradation to be reproduced.

Preferably, the visual environment grasping means includes a means for measuring at least ambient light to grasp the visual environment.

According to this, it is possible to grasp the visual environment by measuring the ambient light. In the visual environment, ambient light has a great effect on the appearance of an image. By measuring ambient light, which is a major factor in the appearance of an image, the visual environment can be properly grasped.

Further, an environment-adaptive presentation system according to the present invention is a presentation system that adjusts the color of a presentation image in accordance with a viewing environment and displays the corrected presentation image. A visual environment grasping means for grasping and generating visual environment information, and converting the visual environment information into coordinate values in a predetermined color space, and coordinate values of the predetermined color in the predetermined color space in a predetermined reference environment. When,
Based on the converted coordinate values, a color light information processing unit that obtains a coordinate value that is a complementary color pair of the converted coordinate value, and a unit that displays the image based on the obtained coordinate value that is the complementary color pair It is characterized by including a correction unit for correcting input / output characteristic data for display to be used, and a display unit for displaying the presentation image based on the corrected input / output characteristic data.

Further, an information storage medium according to the present invention is a computer-readable information storage medium storing information for correcting and displaying a color of a presentation image in accordance with a visual environment, wherein the information is: Grasping a visual environment in a display area of the presentation image, and visual environment grasping means for generating visual environment information; converting the visual environment information into coordinate values in a predetermined color space; Based on the coordinate values of the predetermined color in the predetermined color space and the converted coordinate values,
Correcting the input / output characteristic data for display used by the means for displaying the image, based on the color light information processing means for obtaining a coordinate value serving as a complementary color pair of the converted coordinate value, and the obtained coordinate value serving as the complementary color pair And information for realizing the presentation image on the display means based on the corrected input / output characteristic data.

Further, the information according to the present invention is characterized in that it includes a program for realizing each of the above means.

According to the present invention, the display input / output characteristic data used by the image display means is corrected based on the coordinate value reflecting the environment information and the coordinate value forming the complementary color pair, thereby adapting to the display environment. To display the image. Thereby, the same image can be displayed regardless of the applied environment by absorbing the difference in the display environment. Therefore, substantially the same color can be reproduced in a plurality of different places in a short time.

Here, as the visual environment, for example,
Ambient light (illumination light, natural light, and the like), a display target (display, wall surface, screen, and the like), and the like correspond to this.

The predetermined color is preferably white (gray), but is not limited to white.

As a color space, for example, L * a *
b * (also called Lab) space, L * u * v * space, L
A * C * h space, a U * V * W * space, an xyY (also referred to as Yxy) space, etc. are applicable.

A complementary color pair is a color pair that becomes gray when the colors are mixed.

Preferably, the correction means performs gamma correction as correction of the input / output characteristic data based on the coordinate values forming the complementary color pair.

According to this, accurate color reproduction can be performed by performing gamma correction.

Preferably, the display area is an area on a screen, and the display means includes a projection means for projecting the presentation image toward the screen.

According to this, the visual environment of the display area, which is likely to affect the visual environment of the screen, is grasped and the presentation image is projected and displayed by performing gamma correction and the like, so that almost the same image is obtained regardless of the visual environment. Color can be reproduced.

Here, the screen may be of a reflection type or a transmission type.

In the presentation system, it is preferable that the visual environment grasping means grasps a visual environment reflecting the type of the screen.

In the information storage medium and the program, it is preferable that the visual environment grasping means includes a means for grasping at least a visual environment reflecting a type of a screen.

According to this, the visual environment reflecting the type of the screen is grasped, and gamma correction or the like is performed based on the grasped result, so that the difference in the screen type can be absorbed. Thereby, almost the same color can be reproduced regardless of the type of the screen.

In particular, in a PC or the like using an OS or the like incorporating a conventional color management system, only the type of display connected to the PC is considered. Further, although there has been a proposal to perform color correction in consideration of ambient light, none of them has considered a screen which is a display area of an image.

According to the present invention, an image reflecting the visual environment can be generated and displayed appropriately by grasping the visual environment reflecting the type of the screen and correcting the color.

In the presentation system, it is preferable that the visual environment grasping means includes a means for measuring at least ambient light to grasp the visual environment.

[0044] In the information storage medium and the program, it is preferable that the visual environment grasping means grasps a visual environment reflecting at least ambient light.

According to this, the visual environment can be grasped by measuring ambient light and the like. In the visual environment, ambient light has a great effect on the appearance of an image. By measuring ambient light, which is a major factor in the appearance of an image, the visual environment can be properly grasped.

An environment-adaptive image processing method according to the present invention is an image processing method for correcting a color of an image in accordance with a visual environment. To a coordinate value in a predetermined color space,
A coordinate value calculating step of obtaining a coordinate value serving as a complementary color pair of the converted coordinate value based on the coordinate value of the predetermined color in the predetermined color space in the predetermined reference environment and the converted coordinate value. And a correcting step of correcting input / output characteristic data for display based on the obtained coordinate values of the complementary color pair, and a step of displaying an image based on the corrected input / output characteristic data. Features.

According to the present invention, the input / output characteristic data for display used by the image display means is corrected based on the coordinate value reflecting the environment information and the coordinate value forming the complementary color pair, thereby adapting to the display environment. To display the image. As a result, the same image can be displayed regardless of the applied environment by absorbing the difference in the display environment. Therefore, substantially the same color can be reproduced in a plurality of different places in a short time.

Here, as the visual environment, for example,
Ambient light (illumination light, natural light, and the like), a display target (display, wall surface, screen, and the like), and the like correspond to this.

The predetermined color is preferably white (gray), but is not limited to white.

As the color space, for example, Lab space, L * u * v * space, L * C * h space, U * V * W *
A space, an xyY (also referred to as Yxy) space, and the like correspond.

The complementary color pair is a color pair that becomes gray when the colors are mixed.

Further, the coordinate value calculating step includes a step of obtaining an inverse vector of a binding vector indicating a coordinate position of the converted coordinate value in the color space, as the coordinate value forming the complementary color pair, Preferably includes a step of correcting the input / output characteristic data using the obtained inverse vector as a correction value.

According to this, since the input / output characteristic data can be quantitatively corrected, the correction can be performed at high speed.

Here, the constraint vector is a constraint vector at a gray point on a predetermined color plane in the color space. The term vector is used to mean a vector having a magnitude and a direction.

In the coordinate value calculating step, the coordinates of the complementary color pair may be determined based on a distance between a coordinate position of the converted coordinate value and a predetermined origin in the color space. Calculating a coordinate position of an external dividing point that is a coordinate position of a value, wherein the correcting step includes a step of correcting the input / output characteristic data using the obtained coordinate position of the external dividing point as a correction value. Is preferred.

According to this, since the input / output characteristic data can be quantitatively corrected, the correction can be performed at high speed.

Preferably, in the correcting step, gamma correction is performed as correction of the input / output characteristic data based on the coordinate values forming the complementary color pair.

According to this, accurate color reproduction can be performed by performing gamma correction.

Preferably, in the correction step, a color gamut is corrected as the correction of the input / output characteristic data based on the coordinate values forming the complementary color pair.

According to this, accurate color reproduction can be performed by correcting the color reproduction range.

Note that the color reproduction range is, specifically,
For example, an RGB color triangle, a CMY color triangle, a CMYK color square, etc. correspond.

It is preferable that the coordinate value calculating step includes a step of obtaining coordinate values of a plurality of complementary color pairs for each predetermined gradation unit.

According to this, by obtaining the coordinate values of a plurality of complementary color pairs for each gradation unit, it is possible to perform a correction suitable for the gradation to be reproduced even when reproducing the color of each gradation. Therefore, an appropriate image display can be performed regardless of the gradation to be reproduced.

[0064]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the drawings, taking an example in which the present invention is applied to a presentation system using a liquid crystal projector.

(Description of the Entire System) FIG. 1 is a schematic explanatory diagram of a presentation system using a laser pointer 50 according to an example of the present embodiment.

A predetermined presentation image is projected from a projector 20 provided substantially in front of the screen 10. The presenter 30 uses the screen 10
A spot light 7 projected from a laser pointer 50 at a desired position of an image in an image display area 12 which is an upper display area.
While pointing at 0, give a presentation to a third party.

When making such a presentation, the appearance of the image in the image display area 12 greatly differs depending on the type of the screen 10 and the environmental light 80.
For example, even when displaying the same white, depending on the type of the screen 10, the screen 10 may appear yellowish white or blueish white. Further, even when displaying the same white, if the ambient light 80 is different, it looks bright white or dark white.

In recent years, the size of the projector 20 has been reduced, and the projector 20 has been easily carried. For this reason, for example, a presentation may be made at the customer, but it is difficult to adjust the color in advance according to the environment of the customer, and it takes time to manually adjust the color at the customer. Too much.

FIG. 2 is a schematic explanatory diagram of a presentation system using a mobile projector.

For example, as shown in FIG.
In this example, an image is projected from the projector 20 to the dedicated screen 14 in a visual environment in which there is ambient light 82 generated by a fluorescent lamp. Adjust the appearance of the image in such a test environment,
Conference room 520 to production environment presentation hall 5
It is assumed that the user moves to 30 and projects an image from the projector 20.

At the presentation hall 530, unlike the conference room 520, there is a fluorescent lamp and ambient light 84 due to external light, and an image is displayed using the screen 16 made of a different material from the screen 14.

For this reason, even if the image is adjusted in the conference room 520, the image is adjusted as it is in the presentation room 530.
In this case, the appearance of the image may be different, and the presentation effect that should be obtained may not be obtained.

FIG. 3 is a functional block diagram of an image processing section in a conventional projector.

In a conventional projector, an R1 signal and a G signal forming an analog RGB signal transmitted from a PC or the like are used.
One signal and the B1 signal are input to the A / D converter 110, and the R2, G2, and B2 signals in digital format are subjected to color conversion by the projector image processor 100.

The color-converted R3, G3, and B3 signals are input to a D / A converter 180, and the analog-converted R4, G4, and B4 signals are input to an L / V (light valve) driver. The image is input to 190, and the liquid crystal light valve is driven to perform image projection display.

The projector image processing unit 100 controlled by the CPU 200 includes a projector color conversion unit 120 and a profile management unit 130.

The projector color converter 120 converts each of the RGB digital signals (R2 signal,
The G2 signal and the B2 signal are converted into RGB digital signals (R) for projector output based on the input / output profile of the projector managed by the profile management unit 130.
(3 signals, G3 signal, B3 signal). Here, the profile means characteristic data.

As described above, in the conventional projector, only the color conversion is performed based on the input / output profile indicating the input / output characteristics unique to the projector, and the visual environment in which the image is projected and displayed is considered. Absent.

However, as described above, it is difficult to unify the appearance of colors unless the visual environment is taken into consideration. There are three ways of seeing color: light, reflection or transmission of target light, and vision.
Is determined by two factors.

In the present embodiment, by grasping the visual environment reflecting the reflection or transmission of light and target light,
An image display system that can reproduce the same color regardless of the applied environment is realized.

More specifically, as shown in FIG. 1, the color light sensor 6 functioning as a visual environment grasping means for grasping the visual environment.
0 is provided, and visual environment information from the color light sensor 60 is input to the projector 20. Specifically, the color light sensor 60 measures color light information (more specifically, tristimulus values of RGB or XYZ) of the image display area 12 in the screen 10.

The projector 20 converts the visual environment information into coordinate values in a predetermined color space, and calculates the coordinate values of the predetermined color in the predetermined color space in a predetermined reference environment and the converted coordinate values. And a color light information processing means for obtaining coordinate values that are complementary color pairs of the converted coordinate values based on the above.

Further, the projector 20 is provided with a correcting means for correcting the input / output characteristic data for display used by the means for displaying the image based on the obtained coordinate values as the complementary color pair.

Next, the functional blocks of the image processing section of the projector 20 including these color light information processing means and correction means will be described.

FIG. 4 is a functional block diagram of an image processing unit in the projector 20 according to an example of the present embodiment.

In the projector 20, the R1 signal and the G1 signal constituting the analog RGB signals transmitted from the PC or the like are provided.
The signal and the B1 signal are input to the A / D converter 110, and the R2, G2, and B2 signals in digital format are subjected to color conversion by the projector image processor 100.

The color-converted R3, G3, and B3 signals are input to a D / A converter 180, and the analog-converted R4, G4, and B4 signals are input to an L / V (light valve) driver. The image is input to 190, and the liquid crystal light valve is driven to perform image projection display.

Up to here, there is no difference in configuration from the conventional projector. However, the projector image processing unit 100 of the projector 20 according to the present embodiment includes the color signal conversion unit 160, the color signal inverse conversion unit 170, the color management unit 150, and the projector color conversion unit 120. ing.

The color signal converter 160 is provided for the A / D converter 11
RGB digital signals (R2 signal, G2 signal, B
(2 signals) are converted into XYZ values (X1, Y1, Z1).
Note that the RGB signal is a device-dependent color that changes depending on an input / output device such as the projector 20,
The value is a device-independent color that is the same regardless of the device.

As a specific method of converting the RGB digital signals into XYZ values, for example, a matrix conversion method using a 3 × 3 matrix can be adopted.

The color signal conversion section 160 outputs the converted XYZ values (X1, Y1, Z1) to the color management section 150.

The color management section 150 receives the XYZ values (X1, Y1, Z) input from the color signal conversion section 160.
1) is changed to an XYZ value (X2, Y2,
Z2).

The color management unit 150 includes a color light information processing unit 140 and the profile management unit 1 for managing the input / output profile for the projector 20 described above.
30.

The color light information processing unit 140 converts the white color reflecting the actual visual environment information into coordinate values in the Lab space, and coordinates the white coordinate values in the Lab environment in a predetermined reference environment, and the converted coordinate values, , A coordinate value serving as a complementary color pair of the converted coordinate value is obtained. Note that a complementary color pair is a color pair that becomes gray when colors are mixed with each other.

Further, the color light information processing section 140 outputs the XYZ values (X1, Y1, ZZ) inputted from the color signal conversion section 160.
1) is converted into an XYZ value (X2, Y2, Z2) reflecting the visual environment based on the measurement value of the color light sensor 60.

The profile management unit 130 functions as the above-described correction means, and creates each input / output profile of the RGB signals of the projector 20. Further, the profile management unit 130 manages the RGB input / output characteristics of the projector 20 based on the created input / output profiles of the RGB signals.

The color signal inverse converter 170 converts the XYZ values (X2, Y2, Z2) from the color light information processor 140 into
The matrix inverse conversion is performed on each of the RGB digital signals (the R5 signal, the G5 signal, and the B5 signal) by using the inverse matrix of the matrix of the color signal conversion unit 160 described above.

Further, the projector color converter 120 converts each of the RGB digital signals (R
While exchanging the five signals, the G5 signal, and the B5 signal with the projector profile managed by the profile management unit 130, the digital camera converts the projector output RGB digital signals (the R3 signal, the G3 signal, and the B3 signal).

The projector image processing unit 100 controlled by the CPU 200 includes a projector color conversion unit 120 and a profile management unit 130.

The projector color conversion unit 120 converts each of the RGB digital signals (R6 signal,
The G6 signal and the B6 signal are converted into RGB digital signals (R) for projector output based on the input / output profiles of the RGB signals managed by the profile management unit 130.
(3 signals, G3 signal, B3 signal).

The RGB digital signal for projector output output from projector color conversion section 120 is D / A
The converter 180 converts the RGB analog signal (R4 signal,
G4 signal, B4 signal), and is converted to an L / V driver 190.
Accordingly, the liquid crystal light valve is driven based on the RGB analog signal, and an image is projected and displayed.

As described above, in the present embodiment, an image is projected and displayed in consideration of the visual environment.

Thus, the input / output characteristic data for display used by the image display means is corrected based on the coordinate value reflecting the environment information and the coordinate value forming the complementary color pair, so that the image is adapted to the environment at the time of display. Can be displayed. As a result, the same image can be displayed regardless of the applied environment by absorbing the difference in the display environment. Therefore, substantially the same color can be reproduced in a plurality of different places in a short time.

Next, taking the case of giving an actual presentation as an example, how the above-described color management unit 150 and the like operate will be described using a flowchart.

FIG. 5 is a flowchart showing the flow of the entire presentation according to an example of the present embodiment.

When making a presentation using the projector 20, pre-processing such as creation of an input / output profile by the profile management unit 130 is performed (step S2).

Then, calibration (calibration) is actually performed by projecting a calibration image from the projector 20 onto the screen 10, and adjustment is performed according to the visual environment (step S4).

After the calibration is completed, a presentation is made (step S6).

More specifically, in a reference environment such as an image production environment, a white image is projected from the projector 20 toward the screen 10, and the color light information (accurately, RGB or XYZ tristimulus values) are measured by the color light sensor 60 as the visual environment grasping means.

The visual environment information indicating the color light information measured by the color light sensor 60 is input to the projector 20, and each input / output profile of RGB for obtaining an arbitrary gamma value and color temperature after the arithmetic processing is created. Also, the ideal gamma value and color temperature can have default values as internal data in advance.

Then, in the actual presentation environment, a white image is projected from the projector 20 toward the screen 10 and the image display area 1 where the white image is displayed is displayed.
The second color light information is measured by the color light sensor 60.

The visual environment information indicating the color light information measured by the color light sensor 60 is input to the projector 20, and the input / output profiles of RGB for obtaining an arbitrary gamma value and color temperature after the arithmetic processing are corrected and recreated. .

An actual presentation image is projected and displayed with the RGB input / output profiles corrected.

Next, these preprocessing (step S2) to
The presentation (step S6) will be described in detail in order.

FIG. 6 is a flowchart showing the flow of preprocessing according to an example of the present embodiment.

In the preprocessing (step S2), first, analog signals (R1 signal, G1 signal, B1 signal) of the preprocessing reference white image are converted into digital signals (R2 signal, G2 signal, B2 signal) (step S12).

Then, the digital signal is converted into an XYZ value (X1, Y1, Z1) by the color signal conversion section 160 and output to the color management section 150 (step S14).

The color light information processing unit 140 in the color management unit 150 generates a color space (Lab space) based on the XYZ values (X1, Y1, Z1) (step S).
16). Then, the color light information processing unit 140 calculates and obtains the coordinate value of the reference white in the color space (step S18).

As described above, the color light sensor 60 measures the XYZ values (X3, Y3, Z3) which are the color light information of the image display area 12 displaying the white image, and the visual environment information (X3, Y3, Z3) including the measurement result. X3, Y3, Z3) to the projector 20.

Further, the color light information processing section 140 outputs the XYZ values (X1, Y1, ZZ) inputted from the color signal conversion section 160.
1) is converted into an XYZ value (X2, Y2, Z2) reflecting the visual environment based on the measurement value of the color light sensor 60.

More specifically, the white image is projected and displayed for each predetermined gradation unit, and the color light sensor 60 outputs the XYZ values (X3, Y3, Z) of the white image for each gradation unit.
3), and the color light information processing unit 140 generates a color space (Lab space) based on the XYZ values (X1, Y1, Z1) of the white image for each gradation.

The color signal inverse conversion section 170 receives the XYZ values (X2, Y2, Z2) from the color light information processing section 140.
Are converted into RGB digital signals (R5 signal, G5) using an inverse matrix of the above-described matrix of the color signal conversion unit 160.
The matrix inverse conversion is performed on the five signals and the B5 signal (step S20).

On the other hand, the profile management section 130 determines the R
Each input / output profile of the GB signal is created (step S22). As a result, each input / output profile in the reference environment is created.

The projector color converter 120 converts each of the RGB digital signals (R5 signal, G5 signal) from the color signal inverse converter 170 based on the created input / output profile.
Signals (B5 signals) are converted into RGB digital signals (R3 signals, G3 signals, B3 signals) output from the projector (step S24).

The RGB digital signal for projector output output from projector color conversion section 120 is D / A
The converter 180 converts the RGB analog signal (R4 signal,
(G4 signal, B4 signal) (Step S2)
6).

Then, the liquid crystal light valve is driven by the L / V drive section 190 based on the RGB analog signal (step S28), and a white image is projected and displayed (step S30).

As described above, in the preprocessing (step S2), the color space, the coordinate values in the color space in the reference environment, the input / output profiles of the RGB signals of the projector 20, and the like are created.

Next, calibration (step S
4) will be described.

FIG. 7 is a flowchart showing a flow of calibration according to an example of the present embodiment.

At the place where the actual presentation is made,
Perform calibration before executing the presentation.

In the calibration (step S 4), first, a white image used in the reference environment is projected and displayed on the screen 10 from the projector 20, and the white light is used by the color light sensor 60 to grasp the visual environment of the place where the actual presentation is performed. Image display area 12 where an image is displayed
Is measured (step S32).

Since the color light information is represented as XYZ values, the color light information processing section 140 converts the XYZ values into Lab values (Lab space) using a generally used arithmetic expression (step S34).

Then, the color light information processing section 140 calculates and obtains coordinate values in the color space (Lab space) based on the measured values of the color light sensor 60 (step S36).

Then, the color light information processing section 140 calculates and obtains a coordinate value as a complementary color pair based on the coordinate value in the reference environment obtained in step S18 and the coordinate value in the actual visual environment (step S18). S38).

In this case, as a method of obtaining the coordinate value as a complementary color pair, for example, a method of obtaining an inverse vector of a binding vector indicating a coordinate position of a coordinate value of a white value in an actual presentation environment in a color space is obtained. Can be adopted.

FIG. 9 is a schematic diagram showing the concept of the inverse vector in the Lab space.

As shown in FIG. 9, in the Lab space, the vertical axis is L (brightness), and there are a plurality of a * b * planes along the L axis. In a predetermined a * b * plane, for example, the coordinate value of a white value in an actual presentation environment is (a1)
*, B1 *).

In this case, the coordinate values (a1 *, b1 *) are
It can be regarded as a constraint vector at the origin of the a * b * plane, that is, at a point where the a * b * plane intersects the L axis. Note that the term vector is used here.
It is used as the meaning of a vector having magnitude and direction.

By calculating the inverse vector of the constraint vector, the coordinate values (a1 *, b1 *) and the coordinate values (-a1 *, -b1 *) that are a complementary color pair are obtained.

That is, in the reference environment, white is a point on the L-axis, but in an actual environment, (a1)
*, B1 *).

Therefore, profile management unit 130
Is that, by correcting the color by the inverse vector, the white coordinate value measured in the actual environment is located on the L axis, and the color in the reference environment can be reproduced even in the actual environment. become.

Further, the color light information processing section 140 calculates the XYZ values (X1, Y1, ZZ) based on the coordinate values forming the complementary color pair.
The XYZ values (X2, Y2, Z2) corrected in 1) are output.

The color signal inverse conversion section 170 converts the XYZ values (X2, Y2, Z2) from the color light information processing section 140 into RGB.
Matrix inverse conversion is performed on each digital signal (R5 signal, G5 signal, B5 signal) (step S40).

Further, the profile management section 130 re-creates each input / output profile of the created RGB signal based on the coordinate values of the complementary color pair (step S42).

As described above, actually, the color is corrected for each of a plurality of a * b * planes existing on the L axis, that is, for each predetermined gradation unit such as 16 gradations or 32 gradations. .

Each input / output profile is actually used for gamma correction.

FIG. 10 is a diagram showing the relationship between input and output in RGB input / output characteristics. As shown in FIG. 10A, the greater the voltage, that is, the value of the input (V), the more the brightness, that is, the output (cd /
m ² ) increases.

FIG. 10A is a graph showing RG for ideal light.
4 shows B input / output characteristics. Therefore, the projector 20 can obtain an ideal white color by the RGB input / output characteristics without a black point (●) under the ideal environment without the influence of the ambient light or the screen 10 by the color light information by the color light sensor 60. .

However, in practice, the color light information of the projector 20 is often affected by ambient light, the screen 10 and the like. In the example shown in FIG. 10A, when there is no white correction of the projector 20, color reproduction in which the influence of R and G is strong on the screen 10 is performed.

In such a state, the ideal white light output from the projector 20 is also displayed on the screen 10.
White color is reproduced with a yellow tint. Therefore, in order to correct the influence of the ambient light, the screen 10, and the like included in the color light information of the projector 20, among the three input / output signals of RGB, the input / output signals of R and G are indicated by black dots, as shown in FIG. By reducing the output according to the correction amount, yellowish white can be corrected to ideal white light output from the projector 20.

FIG. 10 (B) shows the R curve and the G curve re-created by shifting the black point of FIG. 10 (A) as it is to the axis of the maximum value of input (the line indicated by the rightmost dotted line). ing. Note that the R curve, G curve, and B curve of the corrected input / output signal characteristics for each of the RGB gradations in FIG. 10B are obtained by the following equations (1) to (3). Further, the correction coefficient is obtained by Expressions (4) to (6).

R signal (bit) = KR × input signal before correction (1) G signal (bit) = KG × input signal before correction (2) B signal (bit) = KB × input signal before correction (3) KR = R maximum input value after correction / 255 (4) KG = G maximum input value after correction / 255 (4) (5) KB = B maximum input value after correction / 255 (6) FIG. 12 is a schematic diagram showing the state of RGB input / output characteristics before and after correction. .

In the color triangle rgb before correction, K (0,
(0, 0), that is, the point at which the brightness axis L passing through black intersects the color triangle rgb is W (1, 1, 1), that is, white.

By performing the above-described correction of the inverse vector on the entire color triangle rgb, the color triangle rgb
Is, for example, a color triangle r'g'b '. In the color triangle r'g'b ', an axis L of brightness passing through black,
White at the point where the color triangle r'g'b 'intersects is W'
(0.9, 0.9, 1) and the color triangle rgb
Is slightly closer to K (0, 0, 0).

As described above, the input / output profile in the actual application environment is created by the calibration (step S4), and the appropriate gamma correction is performed.

Next, the actual presentation after the calibration has been performed in this manner (step S
6) will be described.

FIG. 8 is a flowchart showing the flow of a presentation according to an example of the present embodiment.

At the stage where the calibration has been performed, RGB input / output profiles corresponding to the visual environment have been created. In this state, a normal presentation image is projected and displayed.

In the presentation (step S6), first, the analog signal (R) of the presentation image
One signal, G1 signal, and B1 signal) are converted into digital signals (R6 signal, G6 signal, and B6 signal) by the A / D converter 110 (step S52).

This digital signal (R6 signal, G6 signal,
The B6 signal) is converted into a digital RGB signal (R3 signal, G3) for the projector 20 based on the adjusted RGB input / output profiles by the projector color conversion unit 120.
(3 signals, B3 signal) (step S54).

The RGB digital signal for projector output output from projector color conversion section 120 is D / A
The converter 180 converts the RGB analog signal (R4 signal,
G4 signal, B4 signal) (Step S5)
8).

Then, the liquid crystal light valve is driven by the L / V drive section 190 based on the RGB analog signal (step S60), and the presentation image is projected and displayed (step S62).

As described above, according to the present embodiment, the input / output profile is corrected to reflect the visual environment. Thereby, almost the same image can be reproduced regardless of the environment to which the projector 20 is applied.

Further, by using a complementary color pair at the time of this correction, the correction can be performed easily and quickly. In particular, by correcting the input / output characteristic data for each gradation based on the coordinate values forming a complementary color pair, it is possible to remove the influence of environmental light affecting ideal color light and obtain an ideal white balance. .

(Description of Hardware) Next, the hardware configuration of the projector 20 will be described.

FIG. 13 is an explanatory diagram of a hardware configuration of projector 20 according to an example of the present embodiment.

In the apparatus shown in FIG.
OM 1002, RAM 1004, information storage medium 100
6. Image generation IC 1010, I / O (input / output port) 1
020-1 and 020-2 are connected to each other via a system bus 1016 so that data can be transmitted and received therebetween. Then, it is connected to devices such as the color light sensor 60 and PC via I / Os 1020-1 and 1020-2.

The information storage medium 1006 stores programs,
Image data and the like are stored.

The CPU 1000 controls the entire apparatus and performs various data processing in accordance with programs stored in the information storage medium 1006, programs stored in the ROM 1002, and the like. The RAM 1004 is storage means used as a work area or the like of the CPU 1000.
006 or given contents of the ROM 1002 or the CPU 100
The operation result of 0 is stored. The data structure having a logical configuration for realizing the present embodiment is the RAM 1
004 or the information storage medium 1006.

The various processes described with reference to FIGS. 1 to 12 are realized by an information storage medium 1006 storing a program for performing these processes, a CPU 1000 operating according to the program, an image generation IC 1010, and the like. Note that the processing performed by the image generation IC 1010 or the like may be performed by software using the CPU 1000, a general-purpose DSP, or the like.

Further, as an information storage medium, for example, C
D-ROM, DVD-ROM, ROM, RAM, etc. can be applied, and even if the information reading method is a contact method,
A non-contact method may be used.

Also, instead of the information storage medium 1006, the above-described functions can be realized by downloading a program or the like for realizing the above-described functions from a host device or the like via a transmission path. . That is, the information for implementing each of the functions described above may be embodied in a carrier wave.

(Modifications) The application of the present invention is not limited to the above-described embodiment, but can be applied to various modifications.

In the example described with reference to FIG. 9, an example has been described in which a coordinate value forming a complementary color pair is obtained using an inverse vector. However, a method other than the inverse vector may be used.
For example, it is also possible to obtain a coordinate value serving as a complementary color pair using the external dividing point.

FIG. 11 is a schematic diagram showing the concept of an external dividing point in the Lab space.

As in the case of FIG. 9, in a predetermined a * b * plane, for example, the coordinate value of a white value in an actual presentation environment is A1 (a1, b1), and the a *
The coordinate value of the intersection with the L axis on the b * plane is B1 (a2, b
2), and the coordinate value of the complementary color pair to be obtained is P1 (a3,
b3). The distance from A1 to P is r,
Assuming that the distance from A1 to B1 is s, r = 2s, and since the coordinate values of A1 and B1 are known, the distance s can also be obtained.

In this case, if the method of external dividing point is used, P1
(A3, b3) is obtained by the following equations (7) and (8).

A3 = (− s × a1 + 2s × a2) / (2s−s) = − a1 + 2 × a2 (7) b3 = (− s × b1 + 2s × b2) / (2s−s) = −b1 + 2 × b2 (8) As described above, it is also possible to obtain a coordinate value to be a complementary color pair using the external dividing point.

Further, the present invention can be applied to a case where a presentation or the like is performed by displaying an image using a display means other than the projection means such as the projector described above. Such display means include, for example, a liquid crystal projector, a CRT (Cathode Ray Tube), a PD
P (Plasma Display Panel), F
ED (Field Emission Display)
y), EL (Electro Luminescence)
e), a display device such as a direct-view type liquid crystal display device and the like.

The projector image processing unit 1 described above
The function 00 may be realized by a single image display device (for example, the projector 20), or may be distributed by a plurality of processing devices (for example, distributed processing by the projector 20 and a PC).
It may be realized.

As means for grasping the visual environment, X
The present invention is not limited to the color light sensor 60 for measuring the YZ value, and various visual environment grasping means can be applied. For example, as the visual environment grasping means, for example, a luminance sensor for measuring the luminance value of the display area, a color light sensor for measuring the RGB value of the display area, a chromaticity sensor for measuring the chromaticity value of the display area, etc. Or a combination thereof.

The visual environment grasped by the visual environment grasping means is, for example, ambient light (illumination light, natural light, etc.).
And display target (display, wall, screen, etc.)
And so on. Although the above-described screen 10 is of a reflective type, it may be of a transmissive type. When the screen is a transmission type, it is preferable to apply a sensor that directly scans the screen as the color light sensor.

In the above-described embodiment, an example in which the Lab space is applied as the color space has been described.
u * v * space, L * C * h space, U * V * W * space, x
A yY (also called Yxy) space or the like can be applied.

Further, in the above-described embodiment, an example in which a front projection type projector is applied has been described. However, a rear projection type projector can be applied.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory diagram of a presentation system using a laser pointer according to an example of an embodiment.

FIG. 2 is a schematic explanatory diagram of a presentation system using a mobile projector.

FIG. 3 is a functional block diagram of an image processing unit in a conventional projector.

FIG. 4 is a functional block diagram of an image processing unit in the projector according to an example of the embodiment.

FIG. 5 is a flowchart illustrating a flow of an entire presentation according to an example of the present embodiment.

FIG. 6 is a flowchart illustrating a flow of preprocessing according to an example of the present embodiment.

FIG. 7 is a flowchart illustrating a flow of calibration according to an example of the present embodiment.

FIG. 8 is a flowchart illustrating a presentation flow according to an example of the embodiment.

FIG. 9 is a schematic diagram illustrating a concept of an inverse vector in a Lab space.

FIG. 10 is a diagram showing a relationship between input and output in RGB input / output characteristics, and FIG.
FIG. 10B is a diagram showing B input / output characteristics, and FIG.
FIG. 3A is a diagram after correction of RGB input / output characteristics shown in FIG.

FIG. 11 is a schematic diagram illustrating a concept of an external dividing point in a Lab space.

FIG. 12 is a schematic diagram showing a state before and after correction of RGB input / output characteristics.

FIG. 13 is an explanatory diagram of a hardware configuration of a projector according to an example of the present embodiment.

[Explanation of symbols]

 Reference Signs List 20 Projector 50 Laser pointer 60 Color light sensor 80 Ambient light 120 Projector color conversion unit 130 Profile management unit 140 Color light information processing unit 150 Color management unit 160 Color signal conversion unit 170 Color signal inverse conversion unit 1006 Information storage medium

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G09G 5/36 H04N 9/31 Z 5C082 H04N 1/46 9/69 9/31 17/04 C 9/69 G09G 5/36 530W 17/04 H04N 1/46 Z F term (reference) 5B057 AA01 CA01 CA08 CA12 CA16 CB01 CB08 CB12 CC01 CE17 5C060 BA06 DA00 GA01 GC00 GD01 HB24 JA14 JB06 5C061 BB03 BB11 ACOA 5A FA02 GA01 HA03 KE19 KE20 KM13 KM17 5C079 HB00 HB08 HB09 HB11 LA02 LA12 LB02 MA11 MA17 NA03 NA11 PA05 5C082 AA05 BA02 BA12 BA34 BA35 BB46 CA12 CB03 DA87 EA15 MM02 MM10

Claims (21)

[Claims] 1. An image display system that corrects and displays a color of an image based on visual environment information obtained by a visual environment grasping unit that grasps a visual environment in a display area of an image, wherein the visual environment information includes a predetermined color in the visual environment information. Is converted into coordinate values in a predetermined color space, and based on the coordinate values of the predetermined color in the predetermined color space in the predetermined reference environment and the converted coordinate values, the converted coordinate values are used. Color light information processing means for obtaining a coordinate value serving as a complementary color pair of: a correcting means for correcting display input / output characteristic data used by the means for displaying the image based on the obtained coordinate value serving as the complementary color pair, An environment-adaptive image display system comprising: 2. The color light information processing unit according to claim 1, wherein the color light information processing unit obtains, as the coordinate value to be the complementary color pair, an inverse vector of a binding vector indicating a coordinate position of the converted coordinate value in the color space. The image display system corrects the input / output characteristic data using the obtained inverse vector as a correction value. 3. The image display system according to claim 1, wherein the correction unit performs gamma correction as correction of the input / output characteristic data based on coordinate values forming the complementary color pair. 4. The image display system according to claim 1, wherein said color light information processing means obtains coordinate values of a plurality of complementary color pairs for each predetermined gradation unit. 5. The image display system according to claim 1, wherein said visual environment grasping means includes means for measuring at least ambient light to grasp the visual environment. 6. A presentation system that corrects and displays a color of a presentation image according to a viewing environment and displays the presentation image in a display area of the presentation image and generates viewing environment information. Means, while converting the visual environment information into coordinate values in a predetermined color space, based on the coordinate values in the predetermined color space of the predetermined color in a predetermined reference environment, and the converted coordinate values, A color-light information processing means for obtaining a coordinate value serving as a complementary color pair of the converted coordinate value; and a display input / output characteristic data used by the means for displaying the image based on the obtained coordinate value serving as the complementary color pair. And a display means for displaying the presentation image based on the corrected input / output characteristic data. Border adaptive presentation system. 7. The presentation system according to claim 6, wherein the correction means performs gamma correction as correction of the input / output characteristic data based on the coordinate values forming the complementary color pair. 8. The display device according to claim 6, wherein the display area is an area on a screen, and the display means includes a projection means for projecting the presentation image toward the screen. Presentation system. 9. The presentation system according to claim 6, wherein the visual environment grasping means grasps a visual environment reflecting a type of the screen. 10. The presentation system according to claim 6, wherein the visual environment grasping means includes at least a means for measuring ambient light to grasp the visual environment. 11. An image processing method for correcting a color of an image according to a visual environment, comprising the steps of: grasping a visual environment; and converting the grasped visual environment into coordinate values in a predetermined color space. A coordinate value calculation for obtaining a coordinate value serving as a complementary color pair of the converted coordinate value based on the coordinate value of the predetermined color in the predetermined color space in a predetermined reference environment and the converted coordinate value; A correcting step of correcting input / output characteristic data for display based on the obtained coordinate values of the complementary color pair, and a step of displaying an image based on the corrected input / output characteristic data. An environment-adaptive image processing method characterized by the following. 12. The coordinate value calculating step according to claim 11, wherein, as the coordinate value to be the complementary color pair, a step of obtaining an inverse vector of a binding vector indicating a coordinate position of the converted coordinate value in the color space. The image processing method, wherein the correcting step includes a step of correcting the input / output characteristic data using the obtained inverse vector as a correction value. 13. The coordinate value calculating step according to claim 11, wherein the coordinate value calculating step is performed based on a distance between a coordinate position of the converted coordinate value in the color space and a predetermined origin as the coordinate value to be the complementary color pair. A step of obtaining a coordinate position of an outside point that is a coordinate position of a coordinate value of a complementary color pair, wherein the correcting step corrects the input / output characteristic data using the obtained coordinate position of the outside point as a correction value. An image processing method comprising: 14. The image processing method according to claim 11, wherein in the correction step, gamma correction is performed as correction of the input / output characteristic data based on coordinate values forming the complementary color pair. 15. The image according to claim 11, wherein in the correction step, a color gamut is corrected as correction of the input / output characteristic data based on coordinate values forming the complementary color pair. Processing method. 16. The image processing method according to claim 11, wherein the coordinate value calculating step includes a step of obtaining coordinate values of a plurality of complementary color pairs for each predetermined gradation unit. 17. A computer-readable information storage medium storing information for correcting and displaying a color of a presentation image in accordance with a visual environment, wherein the information is in a display area of the presentation image. A visual environment grasping means for grasping a visual environment and generating visual environment information; and converting the visual environment information into coordinate values in a predetermined color space, and the predetermined color space of the predetermined color in a predetermined reference environment. A color light information processing means for obtaining a coordinate value that is a complementary color pair of the converted coordinate value based on the coordinate value in the above and the converted coordinate value, and the image based on the obtained coordinate value that is the complementary color pair. Correction means for correcting the input / output characteristic data for display used by the means for displaying the image, and the presentation image based on the corrected input / output characteristic data. Information storage medium characterized by including information for realizing a means for displaying on the display means for displaying. 18. The information storage medium according to claim 17, wherein the correction means performs gamma correction as correction of the input / output characteristic data based on the coordinate values forming the complementary color pair. 19. The display device according to claim 17, wherein the display area is an area on a screen, and the display means includes a projection means for projecting the presentation image toward the screen. Information storage medium. 20. The information storage medium according to claim 17, wherein said visual environment grasping means includes means for grasping at least a visual environment reflecting a type of a screen. 21. An information storage medium according to claim 17, wherein said visual environment grasping means grasps at least a visual environment reflecting environment light.